Baby stroller



FIG. 1 is a top, front and right side perspective view of a baby stroller showing my new design;

FIG. 2 is a top, front and left side perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a baby stroller, as shown and described. 